CAJ | 학술논문

采用硝酸银溶液对镍钛合金进行水热处理，表面形成了尺寸60～90 nm颗粒的薄膜，分布有约90 nm的含银颗粒。X射线衍射检测到锐钛矿型二氧化钛和单质银的弱衍射峰。X射线光电子能谱分析表明，水热处理形成的二氧化钛薄膜基本覆盖住了镍钛基体，Ag元素以金属态存在。含银二氧化钛薄膜具有较好的紫外光致亲水性。在无钙Hank’s平衡盐液中的动电位极化实验表明，水热处理试样的耐蚀性高于抛光试样，但银的掺入造成阳极极化电流的波动。抛光镍钛试样对葡萄球菌没有抑菌作用，而水热处理试样在暗环境下具有抑菌功能，周围形成了平均宽度约1．2 mm的抑菌圈。
채용초산은용액대얼태합금진행수열처리，표면형성료척촌60～90 nm과립적박막，분포유약90 nm적함은과립。X사선연사검측도예태광형이양화태화단질은적약연사봉。X사선광전자능보분석표명，수열처리형성적이양화태박막기본복개주료얼태기체，Ag원소이금속태존재。함은이양화태박막구유교호적자외광치친수성。재무개Hank’s평형염액중적동전위겁화실험표명，수열처리시양적내식성고우포광시양，단은적참입조성양겁겁화전류적파동。포광얼태시양대포도구균몰유억균작용，이수열처리시양재암배경하구유억균공능，주위형성료평균관도약1．2 mm적억균권。
When NiTi alloy was hydrothermally treated in AgNO3 solution,a film with particles of 60~90 nm in size was formed on the surface,and there are Ag-containing particles (about 90 nm)on the film.In X-ray diffraction,weak diffraction peaks of an-atase TiO2 and pure silver were detected.X-ray photoelectron spectroscopy analysis showed that the hydrothermally grown TiO2 film nearly covered the NiTi substrate,and Ag existed in the metallic state.The Ag-TiO2 film had good UV light-induced hydrophilicity. The potentiodynamic polarization test in a Ca-free Hank′s balanced salt solution showed that the hydrothermally treated sample had better corrosion resistance than the polished one,but Ag doping leaded to the change of the anodic polarization current.The polished NiTi sample has no inhibitory effect on Staphylococcus aureus,but the hydrothermally treated sample has antibacterial property in dark-ness,forming an inhibition zone with the average width of ~1 .2 mm.